if the sum of all the terms of an AP : 1,4,7,10........x is 287 then find x

Asked by Mohammad Ibrahi...(student), on 2/2/13

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1 + 4 + 7 + 10 +.... + *x* = 287

Let there be

*n*terms in the A.P.

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Posted by Bhaveen(student), on 2/2/13

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